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Stegner Farms Pit <br />Slurry Wall <br />Daily Coustructiou Logs-4/10/00 to 5/6/00 <br />4/10/00 and 4/I I/00 <br />- Si[e preparation was started on approximately April 4. Platform preparation has begun with <br />backfill berms being placed on the inside of the slurry wall with bentonite <br />- A soils testing lab has been set up on site for quality control of construction materials. <br />- A plastic lined slurry pond was built near Station 20+00 for the purpose of mixing trench <br />slurry. <br />- Construction equipment arrived a[ varying times after April 4. <br />- A water pond was dug next [o the slurry pond to enable the use of groundwater for mixing of <br />trench slung. The pH of the water source was 7.10 on the first day of production. <br />-Construction of a pair of backfill berms on the inside of [he slung wall has begun and will be <br />ongoing during the first few days of construction. Bentonite is being mixed into the berm <br />closest to the slurry wall for inclusion in the backfill mix. <br />4/12/00 <br />-First day of digging trench. Trenched 0+00 to 1+25. <br />- Bedrock encountered at 16.5 to 17.0 feet. Initial bedrock key is 3 feet. Bedrock is layered and <br />somewhat crumbly with water apparent in the layering. May need to dig deeper to find more <br />competent bedrock. <br />Dug water pond bigger to keep from running out before each slurry bentonite truck is <br />offloaded. <br />4/13/00 <br />-Trenched 1+25 to 2+00. <br />- Some sediment in bedrock key from 0+00 to 1+25. Delayed to discuss depth of bedrock key to <br />look for better bedrock and to accommodate sediment while maintaining 3-foot key. We will <br />try [o get a 4- [0 5-foot key into bedrock. <br />4/ 14/00 <br />-Cleaned out 0+00 to 0+25 and recovered mainly sand from the bottom of the trench. <br />- Shutdown until all parties can agree on a depth of key based on bedrock conditions as well as a <br />solution for sediment build-up in the trench. <br />4/ 19/00 <br />- RMC, Hall-Irwin, and Camas have agreed to get a desander for the site to removed sediment <br />build-up in [he trench. Until [he desander is operational, [he length of trench dug each day will <br />be cleaned again the following morning to remove sediment. Until the desander is operation, <br />the bedrock key will extend a minimum of four feet into bedrock. Once the desander is <br />operational, the bedrock key will extend a minimum of three feet into bedrock. <br />4/24/00 <br />- Work resumed with bedrock kev a minimum of four feet. <br />- Trenched 2+00 to 3+I 5. <br />Trench slurry is a thin a[ 32 seconds through the Marsh funnel. Hall-Irwin crew having <br />troubles with some of the equipment at [he bentonite mixing pond. <br />H \0636_09\Summaq- ReponslSiegner Daily Logs.n( <br />